Ahmed Helmy

• Professor
• Al-Azhar University

The local scour around bridge piers is one of the most common causes of bridge failures. In general, scour phenomenon is extremely complex in nature and consequently in the past many investigators have attempted to develop conservation, analytical, semi-empirical or empirical equations based on the understanding of mechanics of local and general sc...

Background In terms of the significance of spillways on dams' stability, this research was initiated to propose innovative spillway inlet shapes with the CS “Circular Spillway” and assess their hydraulic performance experimentally. Primarily, previous studies in the field of CSs were accumulated and investigated. Innovative spillway shapes with tri...

Spillways are among the most important hydraulic structures and have the greatest impact on flood control systems. Circular spillways are often used in narrow valleys and with earth dams. Previous studies have focused on this type of spillway due to its sensitivity and importance. One of the most crucial elements affecting a circular spillway's per...

The scour around the piers of bridges greatly affects the safety and balance of the bridges, and many studies have been done in which the scour around the piers in straight channels has been studied. It has been proposed and used of 3 piers of different shape (3 models) (elliptical (M 1), Hexagonal (M 2) and Oblong (M 3)). The effect of the differe...

Prediction of scour depths is an important aspect related to the overall stability of hydraulic structures. In this research, small-scale laboratory experiments were carried out to explore the effectiveness of mixing different percentages of Nanomaterial (Silica fume) to non-cohesive (alluvial) movable bed soil to develop mixture of bed material wi...

Scour is very critical, a natural phenomenon that affects the stability of the hydraulic structure in Egypt such as barrages, spillways due to its erosive effects on the structural elements such as piers, gates, and bed material of the water channel. Several studies focused on using different methods to minimize scour effects such as end sills, cor...

Venturi tube is an applicable and economic alternative device to transfer gas-liquid. It is simply designed easily manufactured and it does not need maintenance. The process of air vacuum through venturi tube has been used widely in many agricultural, industrial and the process of water purification (e.g. chlorine and ozone injecting for drinking w...

The local scour around bridge piers is one of the most common causes of bridges' failures. In general, scour phenomenon is extremely complex in nature and consequently in the past, many investigators have attempted to develop conservation, analytical, semi-empirical or empirical equations based on the understanding of mechanism of both local and ge...

In terms of the importance of management action and regular assessment of water quality, this research was initiated with the objective of establishing a NWQIS “National Water Quality Information System” to assist decision makers to assess water quality, where Ismailia Canal was taken as a case study. Primarily, literature in the field of water qua...

Assessment of High Velocity Free Surface Flow Interaction with a Bridge Pier in A Curved Channel